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On The Ledge

Episode 305: Pots and drainage - does a layer of stones help?

On The Ledge

Jane Perrone

Houseplants, Leisure, Gardening, Home & Garden, Plants

4.8773 Ratings

🗓️ 11 July 2025

⏱️ 33 minutes

🧾️ Download transcript

Summary

Avery Rowe joins me to talk about one of the most vexed questions in the world of gardening - does a ‘drainage layer’ of rocks or gravel aid water drainage from a pot? The answer may surprise you!

For full show notes visit https://www.janeperrone.com/on-the-ledge/2025/6/27/episode-305-pots-and-drainage-does-a-layer-of-stones-help

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Transcript

Click on a timestamp to play from that location

0:00.0

Hello and welcome to On the Ledge podcast.

0:18.6

Surprise!

0:20.3

Yes, I've got another one of my occasional, occasional episodes

0:24.7

coming out into your ears today. I'm Jane Perrone, your host. If you want to hear me more regularly

0:32.7

than these very, very occasional On The Ledge updates, then do check out the Deep Dive podcast for

0:39.1

Scribe-Hound Gardening, which is the other podcast that I make. Every week it comes out on

0:44.3

a Thursday. It's not exclusively about indoor gardening, although that does come up in some episodes,

0:50.3

but it's where I interview people who are fellow Scribehound gardening writers covering all aspects

0:58.1

of the garden world. I'll put a link in the show notes if you want to check it out or just

1:03.5

search for Deep Dive and My Name. And onto this week's show, I am delighted that I got the chance to interview Avery Row again.

1:14.5

You may remember Avery from my episode about the wonderful Tradescantia family, but Avery has many strings to their bow.

1:24.6

And one of these other strings is a ponchant for brilliant academic research,

1:31.4

the kind of stuff that answers questions that we really need answers to. And in this case,

1:38.1

it's the tricky old question of drainage in pots. Back in the day, we were always told that adding a layer of

1:47.4

rocks to the bottle of a pot or gravel would aid with drainage. And then fashions changed,

1:54.4

thoughts changed, and suddenly everyone was decrying this practice as not working. So, Avery, fascinated by this topic as somebody who

2:04.4

grows a lot of potted plants, wanted to find out some scientific grounding for this particular

2:13.0

question. And being Avery and being very thorough, rather than just maybe reading a few books,

2:19.3

Avery decided to research and write a scientific paper for an academic journal.

2:25.9

You can go and read Avery's paper for yourself.

2:28.8

It's been published in a journal called Plaus.

2:32.0

This is a non-profit publisher of open access journals in the sort of

...

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